Joined Cases C-482/13, C-484/13, C-485/13 and C-487/13: Judgment of the Court (First Chamber) of 21 January 2015 (request for a preliminary ruling from the Juzgado de Primera Instancia e Instrucción de Marchena — Spain) — Unicaja Banco, SA v José Hidalgo Rueda and Others (C-482/13), Caixabank SA v Manuel María Rueda Ledesma (C-484/13), Rosario Mesa Mesa (C-484/13), José Labella Crespo (C-485/13), Rosario Márquez Rodríguez (C-485/13), Rafael Gallardo Salvat (C-485/13), Manuela Márquez Rodríguez (C-485/13), Alberto Galán Luna (C-487/13), Domingo Galán Luna (C-487/13) (Reference for a preliminary ruling — Directive 93/13/EEC — Contracts concluded between sellers or suppliers and consumers — Mortgage contracts — Default interest clauses — Unfair terms — Mortgage enforcement proceedings — Moderation of the amount of interest — Powers of the national court)